.header{
    height: 50px;
    background-color: #4294FF;
    color: #fff;
    text-align: center;
    line-height: 50px;
    i{
        position: fixed;
        left: 10px;
    }
}
.reg-btn{
    position: fixed;
    bottom: 10px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #4294FF;
}